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Anonymous Poster #1

Water Sweating For Airlines

02/05/2012 11:05 AM

For the pneumatic cylinder , some times for the supply and exhaust lines water sweating observed. why it will happens?

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#1

Re: water sweating for airlines

02/05/2012 11:17 AM

The air in contact with the surface of the lines has reached its dew point.

Dew point

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#2

Re: water sweating for airlines

02/05/2012 11:41 AM

The line is cold...

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#3

Re: Water Sweating For Airlines

02/06/2012 8:55 AM

There might be some leakage or passing of the hold down valve. High pressure air when let down through small opening causes cooling. That cooling is causing lines to cool below dew point in that region. Hence the atmospheric humidity is getting condensed.

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#4

Re: Water Sweating For Airlines

02/06/2012 9:07 AM

One reason could be that most pneumatic systems use refrigerated dryers. The air is cooled to condense the moisture out. This cool air passing through the lines will drop the temperature of the lines so that moisture is condense out of the ambient air around the line on to them.

Have a air motor here that with it's close proximity to the dryer and volume. When it exhausts during the summer it looks like it smoking. The cool air instantly condense the moisture in the air to a fog.

I would think that since your title says airlines they would use desiccant type dryers. Space and weight being factors. So it maybe an elevation issue air at 20 thousand feet will be much colder then at ground level. If the receiver is of any size it may store the cold air through changes of elevation.

What this pneumatic cylinder on? Thought most airplanes used hydraulic controls.

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#5
In reply to #4

Re: Water Sweating For Airlines

02/06/2012 9:20 AM

I read the title as "Water Sweating For Air Lines", after my initial confusion.??

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#6
In reply to #5

Re: Water Sweating For Airlines

02/06/2012 12:07 PM

That maybe what he meant but not what he wrote.

Well I cover some of the possibilities for both if not.

Now you know my confusion asking for use of pneumatics in an airplane.

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